Sharp VC-780E - Page 28

VC-780E
VC-7S0ET
a ee eh
and put the unit in the playback mode.
2. Set the tracking button to the center position.
3. Adjust R753 (NTSC switching point contral) so
that the waveform on the oscilloscope screen
be as shown in Fig. 2-8.
CH-2
(Video output)
CH-1
CH-1; 2V/div 5Oxusec/div
CH-2; 1V/div 50usec/div
Figure 2-8.
Adjustment of PAL System SP slow tracking
Measuring _| Monitor TV
instrument -
Recording and playback on.
self-recording tape.
Input signal Commercial broadcast or video
signal (external input selector
switch}
Test point Monitor screen
Adjusting point R854 (PAL SP slow tracking
control)
Specification
screen
1. Receive a commercial broadcast signal, or feed the
video signal to the video input terminal (with the
external input selector switch).
2. Make recording and playback on the self-recording
tape.
3.
Press
the
slow
button
and
play
back
the
recorded
portion
in
the
slow
mode.
4. Set the tracking button to the center position.
5. Observing the monitor screen, adjust the PAL
SP slow tracking preset controi (R854) until the
noise bar disappears form the screen.
6. Press the playback button to piay back the tape. Then
push the pause/still button to reproduce the recording
in the still mode. Now make sure there is no noise on
the screen. (Repeat this step three times or so.)
1. Insert the NTS System alignment tape (VROATSV) - -
No noise bar on the monitor TV
Adjustment of NTSC System SP slow tracking
Measuring Monitor TV
instrument
mae Recording and playback on
self-recording tape.
Input signal
Video signal
(external input selector switch)
Adjusting
point
R856
(NTSC
SP
slow
tracking
control)
Specification
No
noise
bar
on
the
monitor
TV
screen
1
. Feed the video signal to the video input terminal
(with the external input selector switch).
Test point
2. Make recording and playback on the self-recording
tape.
3. Press the slow button and play back the recorded
portion in the slow mode.
4. Set the tracking button to the center position.
5. Observing the monitor screen, adjust the NTSC
SP slow tracking preset control (R856) unit the
noise bar disappears form the screen.
6.
Press
the
playback
button
to
play
back
the
tape.
Then
push
the
pause/still
button
to
reproduce
the
recording
in
the
still
mode.
Now
make
sure
there
is
no
noise
on
the
screen.
(Repeat
this
step
three
times
or
so.)
Adjustment of PAL System LP slow tracking
Measuring Monitor TV
instrument
Recording and playback on
self-recording tape.
input
signal
Commercial
broadcast
or
video
signal
(external
input
selector
switch)
Adjusting
point
R855
(PAL
LP
slow
tracking
control)
No
noise
bar
on
the
monitor
TV
screen
1. Receive a commercial broadcast signal, or Feed
the video signal to the video input terminal
(with the external input selector switch).
2. Make recording and playback on the self-recording
tape.
3. Press the slow button and play back the recorded
portion in the siow mode.
Test point
Specification